Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in a phased array in such a way that signals at particular angles experience constructive interference while others experience destructive interference.

Application of antenna arrays to mobile communications. II. Beam-forming and direction-of-arrival considerations
Beam-forming matrix simplifies design of electronically scanned antennas
Cooperative beam-forming in wireless networks
Performance Comparison of Reflector- and Planar-Antenna Based Digital Beam-Forming SAR
SweepSAR: Beam-forming on receive using a reflector-phased array feed combination for spaceborne SAR
Constrained Hung-Turner adaptive beam-forming algorithm with additional robustness to wideband and moving jammers
Bohme, “Constrained Hung–Turner adaptive beam-forming algorithm with additional robustness to wide-band and moving jammers
SweepSAR: Beam-forming on receive using a reflector
A photonic integrated-optic RF phase shifter for phased array antenna beam-forming applications
Silicon-Based Ultra-Wideband Beam-Forming